US6440348B1 - Method and mould for producing umbrella insulators - Google Patents

Method and mould for producing umbrella insulators Download PDF

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Publication number
US6440348B1
US6440348B1 US09/485,063 US48506300A US6440348B1 US 6440348 B1 US6440348 B1 US 6440348B1 US 48506300 A US48506300 A US 48506300A US 6440348 B1 US6440348 B1 US 6440348B1
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US
United States
Prior art keywords
mold
valve
core
umbrella
collar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/485,063
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English (en)
Inventor
Herbert Oppelt
Willi Deuerling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trench Germany GmbH
Original Assignee
Trench Germany GmbH
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Filing date
Publication date
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Assigned to TRENCH GERMANY GMBH reassignment TRENCH GERMANY GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DEUERLING, WILLI, OPPELT, HERBERT
Application granted granted Critical
Publication of US6440348B1 publication Critical patent/US6440348B1/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/46—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles using fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3412—Insulators

Definitions

  • the present invention relates to a method and a mold for producing an umbrella-type insulator made of plastic material, having a core constructed as a solid body and having umbrellas connected with the core as well as having collars which are molded to the umbrellas and coaxially surround the core, by a mold which reaches coaxially around the core and forms a ring gap with respect to the core at the collar end of the respective umbrella to be molded.
  • the ring gap being sealed off by means of an elastic seal, and wherein after sealing off, a first pourable material, which cross-links with the core to form a firm electrically insulating body, is poured into the mold and after the cross-linkage and the formation of the respective umbrella with the collar, the mold with the seal is moved away from the umbrella and in the process, the formed umbrella with the collar is removed from the mold.
  • An umbrella-type insulator of this type is known from German Patent Document DE-A-23 00 145. It consists of a core and of several umbrellas which are molded to the core and have one downward-extending collar respectively molded to the umbrellas and connected with the core. The production takes place such that first a two-part mold, which is tightly pressed together, is placed over the core and forms a funnel-shaped casting mold; during the pouring-in of the insulating material, the conical portion of the casting mold forming the umbrella and its lower portion forming the collar. On the bottom, the mold surrounds the core at a distance in the form of a ring gap which is sealed off before the casting process by a sealing ring. After the solidification of the insulating material, the mold parts are laterally taken off.
  • This object is achieved by utilizing a mold which has at least one laterally arranged valve which extends to a surface of one of the umbrella and the collar coaxially around the core; pouring a material into the mold which cross-links with the core to form the insulating body comprising a core, collar and umbrella; begin axial moving-away of the mold from the umbrella and collar resulting in a vacuum forming between the mold and the formed insulating body; and then opening the valve and allowing a gaseous medium to be introduced into a cavity formed between the insulator and the mold so that the pulling-away of the mold is permitted without any unacceptable deformation of the umbrella.
  • the umbrella can no longer adhere to the mold during the removal from the mold because a vacuum forms between the mold and the umbrella only for a short time or not at all.
  • the umbrella can therefore be removed from the mold without any deformation.
  • FIG. 1 is a one half of a cross-sectional lateral view of an umbrella molded to a core, while the mold is in the cast condition;
  • FIG. 2 is a view according to FIG. 1 in a partially de-molded condition with and without a deformation of the umbrella;
  • FIG. 3 is a cross-sectional view of a valve inserted in the mold.
  • Reference number 1 indicates a portion of an umbrella-type insulator whose core is configured as a solid body or—as illustrated—a hollow body 2 and has an umbrella 3 molded thereto with a molded-on collar 4 .
  • the core 2 consists of an insulating material, particularly made of silicone, reinforced by means of reinforcing media, particularly glass fibers.
  • a single-part or multi-part mold 5 is pushed over the core 2 , which mold 5 has a funnel-shaped mold space 5 . 1 which is shaped corresponding to the umbrella 3 with the collar 4 to be molded.
  • the portion 5 . 2 of the mold space 5 . 1 forming the collar 4 has a ring gap 6 at the collar end 4 . 1 , which ring gap 6 is closed off for the casting process by an elastic seal 7 , for example, in the form of a ring seal or O-seal.
  • a valve 8 for example, in the shape of a disk valve or cone valve, is provided, particularly screwed in laterally in the mold 5 in the area of the collar end 4 . 1 .
  • the exterior surface 8 . 1 of the valve 8 advantageously extends to the surface of the umbrella or to the surface 4 . 2 of its collar 4 . In particular, it is flush with the surface 5 . 3 of the mold 5 .
  • the mold is first placed at the assigned location on the core 2 or on the core wall and is sealed off by means of the elastic seal 7 . Subsequently, the mold space 5 . 1 is filled from above with a casting material which then solidifies to an insulating molded body.
  • the mold 5 After the hardening or solidifying of the cast-in material, the mold 5 , together with the seal 7 , is moved away downward in the drawing. As illustrated in FIG. 2, this creates a cavity 9 .
  • a vacuum is formed in the cavity 9 and, when the valve 8 is absent, pulls the umbrella 3 downward in the manner indicated by a broken line, which may cause tension or even cracks on its top side.
  • this valve 8 when the mold 5 is moved away downward, this valve 8 can now open by itself because of the vacuum and/or additionally by the introduction or blowing-in of a gaseous medium, particularly air, for example, with an excess pressure.
  • a gaseous medium particularly air, for example
  • a valve with a valve tappet 8 . 2 and with a valve disk or cone 8 . 3 is used as the valve 8 .
  • the activating into the open position takes place by means of pressure onto the valve tappet 8 . 2 against the force of a pressure spring 10 which is clamped in between a stop 8 . 4 of the valve tappet 8 . 2 and a stop 11 . 1 of a valve housing 11 , as illustrated in FIG. 3 .
  • a pressure spring 10 which is clamped in between a stop 8 . 4 of the valve tappet 8 . 2 and a stop 11 . 1 of a valve housing 11 , as illustrated in FIG. 3 .
  • As the result of the corresponding construction of the valve tappet 8 . 2 it can also be activated by pulling.
  • the activating can take place mechanically, electrically, hydraulically or pneumatically.
  • the exterior surface 8 . 1 of the valve cone 8 . 3 and the edge 11 . 2 of the valve housing 11 surrounding the exterior surface 8 . 1 are preferably ground jointly in a single grinding process.
  • the valve 8 can advantageously be mounted in the mold 5 such that it is situated in the area of the portion 5 . 2 of the mold space 5 . 1 forming the collar 4 or in the area 12 of the collar end 4 . 1 .
  • mold-side valve surface (exterior surface 8 . 1 ) to be aligned with the adjacent mold surface 5 . 3 .
  • the valve 8 preferably has a valve tappet 8 . 2 with a mold-side valve disk or valve cone 8 . 3 .
  • valve tappet 8 . 2 is advantageously guided in a valve housing 11 and is held in the closed position by means of a pressure spring 10 , in which case the exterior surface 8 . 1 of the valve disk or valve cone 8 . 3 and the edge 11 . 2 of the valve housing 11 surrounding the valve disk or valve cone 8 . 3 are constructed in a jointly ground manner.
  • valve 8 may be laterally inserted, particularly screwed into the mold 5 .
  • the removal from the mold preferably takes place in that the mold is first moved away so far downward that the valve cone or the valve disk 8 . 3 during the opening of the valve 8 cannot press against the collar 4 but possibly strikes against the core 2 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Insulating Bodies (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Fuses (AREA)
  • Insulators (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
US09/485,063 1997-08-08 1998-07-29 Method and mould for producing umbrella insulators Expired - Fee Related US6440348B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19734362A DE19734362A1 (de) 1997-08-08 1997-08-08 Verfahren und Form zur Herstellung von Schirmisolatoren
DE19734362 1997-08-08
PCT/DE1998/002209 WO1999008290A1 (de) 1997-08-08 1998-07-29 Verfahren und form zur herstellung von schirmisolatoren

Publications (1)

Publication Number Publication Date
US6440348B1 true US6440348B1 (en) 2002-08-27

Family

ID=7838378

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/485,063 Expired - Fee Related US6440348B1 (en) 1997-08-08 1998-07-29 Method and mould for producing umbrella insulators

Country Status (10)

Country Link
US (1) US6440348B1 (uk)
EP (1) EP1004123B1 (uk)
JP (1) JP4316791B2 (uk)
CN (1) CN1252739C (uk)
AT (1) ATE255767T1 (uk)
CA (1) CA2299382C (uk)
DE (2) DE19734362A1 (uk)
RU (1) RU2214014C2 (uk)
UA (1) UA54542C2 (uk)
WO (1) WO1999008290A1 (uk)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293317A1 (en) * 2001-09-14 2003-03-19 SACMI COOPERATIVA MECCANICI IMOLA S.c.r.l. Device for releasing and removing flexible synthetic material elements from a molding surface
US20040159980A1 (en) * 2001-04-08 2004-08-19 Harald Janssen Method and device for producing an electric insulator made from plastic
WO2004076150A1 (en) * 2003-02-26 2004-09-10 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa In Short Sacmi Imola S.C. Demoulding apparatus
US20070057409A1 (en) * 2003-09-03 2007-03-15 Bridgestone Corporation Mold for foam molding, method of manufacturing urethane foam, and urethane foam

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10132375A1 (de) * 2001-07-07 2003-01-16 Trench Germany Gmbh Verfahren und Vorrichtung zur Herstellung eines elektrischen Kunststoffisolators
CN100341077C (zh) * 2004-07-09 2007-10-03 上海Mwb互感器有限公司 复合绝缘子的制造方法及其模具
DE102007002118A1 (de) 2007-01-11 2008-07-17 Siemens Ag Isolator sowie Verfahren zur Herstellung eines Isolators
EP2048673B1 (en) * 2007-10-12 2014-05-14 ABB Research Ltd. A device for electric connection, a method for producing such a device, and an electric power installation provided therewith
GB2461515A (en) * 2008-07-01 2010-01-06 Tyco Electronics Ltd Uk Pneumatic insulating device
CN102254654B (zh) * 2011-05-11 2012-10-03 江苏九鼎新材料股份有限公司 一种空心硅橡胶复合绝缘子的生产方法
JP7343173B2 (ja) 2020-01-31 2023-09-12 株式会社テイエルブイ ドレン排出機構を有する蒸気使用システム及び蒸気使用システムのドレン排出方法。

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372907A (en) 1980-01-29 1983-02-08 Siemens Aktiengesellschaft Method for manufacturing plastic electrical insulators
US4620959A (en) * 1983-02-25 1986-11-04 Ngk Insulators, Ltd. Method of releasing an inner mold from a rubbery elastic molding
US4690630A (en) 1986-03-25 1987-09-01 Ceraver Device for stripping from a mold a composite electrical insulator
US5023406A (en) * 1988-02-08 1991-06-11 Raychem Limited High voltage insulator
US5556587A (en) * 1989-06-21 1996-09-17 Ngk Insulators, Ltd. Method of manufacturing ceramics using a porous mold
US5648132A (en) 1994-12-28 1997-07-15 Ngk Insulators, Ltd. Composite insulator, segment used for producing the same and method of producing the same by using the segment
US5702731A (en) * 1994-12-28 1997-12-30 Ngk Insulators, Ltd. Lateral type molding apparatus for the production of composite insulators
US5914462A (en) * 1995-02-21 1999-06-22 Ngk Insulators, Ltd. Composite insulator having end fittings with gaps
US6019931A (en) * 1996-12-27 2000-02-01 Ngk Insulators, Ltd. Method of molding composite insulator and metal molding apparatus used for this molding method
US6033201A (en) * 1996-03-18 2000-03-07 Ngk Insulators, Ltd. Method for producing composite insulator
US6042771A (en) * 1995-03-20 2000-03-28 Ngk Insulators, Ltd. Method for manufacturing composite insulators
US6051796A (en) * 1994-07-29 2000-04-18 Ceramtec Ag Innovative Ceramic Engineering Electric insulator made from silicone rubber for high-voltage applications
US6242902B1 (en) * 1999-11-19 2001-06-05 Siemens Aktiengesellschaft Measuring configuration, and use of the measuring configuration

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT338505B (de) * 1972-01-31 1977-08-25 Precision Flexmold Giessform
DE2545711A1 (de) * 1975-10-11 1977-04-21 Haendle & Soehne Karl Vorrichtung zum herstellen von vorzugsweise duennwandigen formlingen aus schaeumbarem kunststoff
DE2858128C2 (de) * 1978-12-13 1984-06-07 Otto Fuchs Kg, 5882 Meinerzhagen Vorrichtung zum herstellen eines waermegedaemmten verbundprofils
FR2513934A1 (fr) * 1981-10-06 1983-04-08 Thomson Csf Procede de demoulage de disque porteur d'informations et dispositif mettant en oeuvre un tel procede
DE3303913A1 (de) * 1983-02-05 1983-09-22 Daimler-Benz Ag, 7000 Stuttgart Vorrichtung zum umformen von kunststoffolien
DE4200112A1 (de) * 1992-01-04 1993-07-08 Ruetgers Pagid Ag Verfahren zum entformen duroplastgebundener formteile und vorrichtung dazu
DE29604660U1 (de) * 1996-03-13 1996-06-27 Plasttechnik Greiz GmbH, 07973 Greiz Vorrichtung zum besseren Herauslösen des Stützkernes aus einer PUR-Schäumform

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372907A (en) 1980-01-29 1983-02-08 Siemens Aktiengesellschaft Method for manufacturing plastic electrical insulators
US4620959A (en) * 1983-02-25 1986-11-04 Ngk Insulators, Ltd. Method of releasing an inner mold from a rubbery elastic molding
US4690630A (en) 1986-03-25 1987-09-01 Ceraver Device for stripping from a mold a composite electrical insulator
US5023406A (en) * 1988-02-08 1991-06-11 Raychem Limited High voltage insulator
US5556587A (en) * 1989-06-21 1996-09-17 Ngk Insulators, Ltd. Method of manufacturing ceramics using a porous mold
US6051796A (en) * 1994-07-29 2000-04-18 Ceramtec Ag Innovative Ceramic Engineering Electric insulator made from silicone rubber for high-voltage applications
US5702731A (en) * 1994-12-28 1997-12-30 Ngk Insulators, Ltd. Lateral type molding apparatus for the production of composite insulators
US5648132A (en) 1994-12-28 1997-07-15 Ngk Insulators, Ltd. Composite insulator, segment used for producing the same and method of producing the same by using the segment
US5914462A (en) * 1995-02-21 1999-06-22 Ngk Insulators, Ltd. Composite insulator having end fittings with gaps
US6042771A (en) * 1995-03-20 2000-03-28 Ngk Insulators, Ltd. Method for manufacturing composite insulators
US6033201A (en) * 1996-03-18 2000-03-07 Ngk Insulators, Ltd. Method for producing composite insulator
US6019931A (en) * 1996-12-27 2000-02-01 Ngk Insulators, Ltd. Method of molding composite insulator and metal molding apparatus used for this molding method
US6242902B1 (en) * 1999-11-19 2001-06-05 Siemens Aktiengesellschaft Measuring configuration, and use of the measuring configuration

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040159980A1 (en) * 2001-04-08 2004-08-19 Harald Janssen Method and device for producing an electric insulator made from plastic
US7214338B2 (en) * 2001-04-08 2007-05-08 Trench Germany Gmbh Method and device for producing an electric insulator made from plastic
EP1293317A1 (en) * 2001-09-14 2003-03-19 SACMI COOPERATIVA MECCANICI IMOLA S.c.r.l. Device for releasing and removing flexible synthetic material elements from a molding surface
US20030054066A1 (en) * 2001-09-14 2003-03-20 Sacmi Cooperativa Meccanici Imola S.C.R.L. Device for releasing and removing flexible synthetic material elements from a molding surface
US6981864B2 (en) 2001-09-14 2006-01-03 Sacmi Cooperativa Meccanici Imola S.C.R.L. Device for releasing and removing flexible synthetic material elements from a molding surface
WO2004076150A1 (en) * 2003-02-26 2004-09-10 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa In Short Sacmi Imola S.C. Demoulding apparatus
US20070057409A1 (en) * 2003-09-03 2007-03-15 Bridgestone Corporation Mold for foam molding, method of manufacturing urethane foam, and urethane foam
US7575427B2 (en) * 2003-09-03 2009-08-18 Bridgestone Corporation Mold for foam molding, method of manufacturing urethane foam, and urethane foam

Also Published As

Publication number Publication date
UA54542C2 (uk) 2003-03-17
CN1252739C (zh) 2006-04-19
CA2299382A1 (en) 1999-02-18
EP1004123B1 (de) 2003-12-03
ATE255767T1 (de) 2003-12-15
RU2214014C2 (ru) 2003-10-10
CA2299382C (en) 2005-11-08
DE59810355D1 (de) 2004-01-15
EP1004123A1 (de) 2000-05-31
WO1999008290A1 (de) 1999-02-18
JP2001512889A (ja) 2001-08-28
CN1265772A (zh) 2000-09-06
DE19734362A1 (de) 1999-02-11
JP4316791B2 (ja) 2009-08-19

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